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+.. _`rados-objclass-api-sdk`:
+
+===========================
+SDK for Ceph Object Classes
+===========================
+
+`Ceph` can be extended by creating shared object classes called `Ceph Object
+Classes`. The existing framework to build these object classes has dependencies
+on the internal functionality of `Ceph`, which restricts users to build object
+classes within the tree. The aim of this project is to create an independent
+object class interface, which can be used to build object classes outside the
+`Ceph` tree. This allows us to have two types of object classes, 1) those that
+have in-tree dependencies and reside in the tree and 2) those that can make use
+of the `Ceph Object Class SDK framework` and can be built outside of the `Ceph`
+tree because they do not depend on any internal implementation of `Ceph`. This
+project decouples object class development from Ceph and encourages creation
+and distribution of object classes as packages.
+
+In order to demonstrate the use of this framework, we have provided an example
+called ``cls_sdk``, which is a very simple object class that makes use of the
+SDK framework. This object class resides in the ``src/cls`` directory.
+
+Installing objclass.h
+---------------------
+
+The object class interface that enables out-of-tree development of object
+classes resides in ``src/include/rados/`` and gets installed with `Ceph`
+installation. After running ``make install``, you should be able to see it
+in ``<prefix>/include/rados``. ::
+
+ ls /usr/local/include/rados
+
+Using the SDK example
+---------------------
+
+The ``cls_sdk`` object class resides in ``src/cls/sdk/``. This gets built and
+loaded into Ceph, with the Ceph build process. You can run the
+``ceph_test_cls_sdk`` unittest, which resides in ``src/test/cls_sdk/``,
+to test this class.